Thing is, even Van Persie used to be poor at playing the lone striker role a couple of years ago.
Btw, Di Natale is looking lost among Juve's 3 CB's, too much space between him and Abdi and the rest of Udinese's midfield. Guidolin should bring in Torje to play behind Di Natale, he's more dynamic than Abdi and would link up better with Di Natale.